晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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Current File : //opt/alt/ruby30/share/rubygems/rubygems/deprecate.rb
# frozen_string_literal: true
##
# Provides a single method +deprecate+ to be used to declare when
# something is going away.
#
#     class Legacy
#       def self.klass_method
#         # ...
#       end
#
#       def instance_method
#         # ...
#       end
#
#       extend Gem::Deprecate
#       deprecate :instance_method, "X.z", 2011, 4
#
#       class << self
#         extend Gem::Deprecate
#         deprecate :klass_method, :none, 2011, 4
#       end
#     end

module Gem::Deprecate

  def self.skip # :nodoc:
    @skip ||= false
  end

  def self.skip=(v) # :nodoc:
    @skip = v
  end

  ##
  # Temporarily turn off warnings. Intended for tests only.

  def skip_during
    Gem::Deprecate.skip, original = true, Gem::Deprecate.skip
    yield
  ensure
    Gem::Deprecate.skip = original
  end

  def self.next_rubygems_major_version # :nodoc:
    Gem::Version.new(Gem.rubygems_version.segments.first).bump
  end

  ##
  # Simple deprecation method that deprecates +name+ by wrapping it up
  # in a dummy method. It warns on each call to the dummy method
  # telling the user of +repl+ (unless +repl+ is :none) and the
  # year/month that it is planned to go away.

  def deprecate(name, repl, year, month)
    class_eval do
      old = "_deprecated_#{name}"
      alias_method old, name
      define_method name do |*args, &block|
        klass = self.kind_of? Module
        target = klass ? "#{self}." : "#{self.class}#"
        msg = [ "NOTE: #{target}#{name} is deprecated",
                repl == :none ? " with no replacement" : "; use #{repl} instead",
                ". It will be removed on or after %4d-%02d." % [year, month],
                "\n#{target}#{name} called from #{Gem.location_of_caller.join(":")}",
        ]
        warn "#{msg.join}." unless Gem::Deprecate.skip
        send old, *args, &block
      end
      ruby2_keywords name if respond_to?(:ruby2_keywords, true)
    end
  end

  ##
  # Simple deprecation method that deprecates +name+ by wrapping it up
  # in a dummy method. It warns on each call to the dummy method
  # telling the user of +repl+ (unless +repl+ is :none) and the
  # Rubygems version that it is planned to go away.

  def rubygems_deprecate(name, replacement=:none)
    class_eval do
      old = "_deprecated_#{name}"
      alias_method old, name
      define_method name do |*args, &block|
        klass = self.kind_of? Module
        target = klass ? "#{self}." : "#{self.class}#"
        msg = [ "NOTE: #{target}#{name} is deprecated",
                replacement == :none ? " with no replacement" : "; use #{replacement} instead",
                ". It will be removed in Rubygems #{Gem::Deprecate.next_rubygems_major_version}",
                "\n#{target}#{name} called from #{Gem.location_of_caller.join(":")}",
        ]
        warn "#{msg.join}." unless Gem::Deprecate.skip
        send old, *args, &block
      end
      ruby2_keywords name if respond_to?(:ruby2_keywords, true)
    end
  end

  # Deprecation method to deprecate Rubygems commands
  def rubygems_deprecate_command
    class_eval do
      define_method "deprecated?" do
        true
      end

      define_method "deprecation_warning" do
        msg = [ "#{self.command} command is deprecated",
                ". It will be removed in Rubygems #{Gem::Deprecate.next_rubygems_major_version}.\n",
        ]

        alert_warning "#{msg.join}" unless Gem::Deprecate.skip
      end
    end
  end

  module_function :rubygems_deprecate, :rubygems_deprecate_command, :skip_during

end